sheets-sheet i



Feb. 6, 1923. 1,444,192. w. KoEcK 'E1 AL.

JACK.

FILED MAK. I6, 1920. 2 SHEETS-SHEET l.

Feb. 6. 1923.

w. KOEGK ET AL.

JACK.

FILED MAR. 16. 1920.

2 SHEETS-SHEET 2 3 @lA/bww( rdf/A34', 04,9@

Patented leb. ti, lgfii UltllTEM STATES WILLIAM KOECK AND JOSEPH KOECK, OF OSHKOSH, VIISCONSN.

JACK.

Application filed March 16, 1920. Serial No. 366,255.

Jacks, oil which the Yfollowing is a description, reference being had to the accompanying drawings, which are a part of this specitication.

The present invention relates to certain new and useful improvements in lifting jacks.

@ne object oif the present invention is to provide a liiting jack so constructed that the operatorl may position the same beneath a car and raise or lower same without kneeling to operate the releasing mechanism and thus proving a great convenience over the jacks now in every day use.

Another object oi this invention is to provide a ack in which the lifting or elevating member may be raised its entire limit of movement by one movement ot the operating handle, ii' desired.

A further object ot our invention is to provide a jack ot the described utilizing means i'or obtaining the desired `leverage and provided with means 'tor locking the elevating member in any one oi? several positions.

A still 'further object ot the present invention is to provide a jack of the class described which will be of comparatively light construction but readily capable of supporting heavy weights, and which will have a powerful leverage and will perform its t'unctions in an etticient manner.

lilith the above and other objects in view which will appear as the description proceeds, our invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes iu the precise embodiment oi'. the hereindisclosed invention may be made as come within the scope oit the claims.

ln the accompanying drawings we have illustrated one complete example oi the physical embodiment oil our invention constructed according to the best mode we have so 'tar devised -for the practical application oi" the principles thereof, and in which:

Figure i. is a side view of our improved jack with the elevating member in its fully -17 t'ormed in the standards l extended position, parts being broken away and in section to more clearly illustrate structural details.

Figure 2 is a side elevational view thereo'l:I with the elevating member in its lowermost position.

Figure 3 is a sectional view taken through our improved jack on the line. 3--3 oi Figure 2.

Figure. 4lis a View part in section and part in elevation taken on the plane indicated by the line 4 4 oil' Figure 5, the elevating member being depicted in an intermediate position, and

Figure 5 is a sectional view taken through our improved jack on the line 5-5 ot Figure t.

Referring now more particularly to the drawings, the numeral l0 designates a body portion or supporting base trom which extends a tubular or channeled standard l1 in which is slidably mounted an elevating inember including two complementary strips or the like 12. The members l2 are secured together at their upper ends and retained in spaced relation by means ol" a cap 13, shaped to engage with various shaped articles to be litted.

The lower ends ol' the members 12 are retained in spaced relation by means oit two complementary discs or wheels la journally mounted therebetween adjacent their lower ends by means oi' a stub sha'lt or journal pin 15. The stub shaft l5 has its ends slidably mounted within elongated apertures 16 and and the menibers l2 respectively, which construction permits the. vertical movement otl the elevating member within said standard, such movement being equal to the combined length of the apertures 1G and'l.

The discs ist are maintained in spaced relation depicted in Figures 3 and 5 by means oi toggle links i8 and 19 and an operating lever receiving socket 20. The lever .receiving socket 20 has its inner end 2l dattened to a. thickness equal to the distance between the discs lil and is provided with an elongated slot 2Q through which the pin l5 passes. The toggle links i8 and 19 are oi? a thickness substantially the same as 'the inner flattened ends oit the socket member 20, and the toggle link i8 has its lower end ,oivotally secured between the discs let adjacent the periphery thereof by a pin 23 and has its upper end pivotally secured as at 2a to the cap lil.

lll)

The toggle link 19 has its upper end pivotally secured between the discs 14 by a pin 25 positioned diametrically opposite the pin 23, and has its lower end pivotally secured as at 26 to the base 10. This construction extends or elevates the cap 13 upon rotation of the discs 14 on their pivots 15 to bring the pins 23 and 25 in substantially vertical alignment, see Figure 1.

The jack is maintained in its extended position by a slight movement of the discs 14 to bring the pins 23 and 25 be ond an imaginary line drawn perpen icularly through the center of the pin 15, and the link 19 will abut a projection 27 carried by the standard 11. When the members 12 are completely telescoped within the standard 11 their lowermost ends engage or impinge against the base 10 and apertures 28 formed therein permit the same to pass over the pin 26.

The discs 14 are rotated by the handle 20 which is provided with two opposed lugs 29 engageable within complementary lopposed openings 30 formed in the discs 14. The openings 30 are shaped to provide shoulders or locking recesses 31 in which the projections 29 are seated when it is desired to elevate the cap 13 its entire limit of movement upon one movement of the hand. In the event that the automobile bumper or some other obstacle prevents the positioning `of the handle 2() to engage the recesses 31, the projections 29 are engaged in low-er recesses 32 and'the discs given a partial rotation and held in such position by means to be later described, until the lugs 29 can be engaged in recesses 33 slightly above the recesses 32 and permit the continued movement or rotation of the discs to fully elevate the cap 13 and pass the pins 23 and 25 beyond center as before described.

The means for maintaining the discs in such partial rotated position includes a` pawl or latch member 34 having its lower end pivoted as at 35 to the base and its upper end engageable with the periphery ofthe discs by means of an extensile spring 36 abutting the standard 11 and a lip 37 iormed on the pawl 34 below its pivot.

The discs 14 are provided in their periphery with aligned lockino' recesses 38 adapted to receive the upper end of the pawl 34 and be thus held from counter-clockwise rotation with respect to Figures l and 4 beyond said pawl unless the pawl is urged outwardly against the action of its spring Thus with this construction, when the projections 28 are engaged in the recesses 32 and the cap 13 elevated approximately one-half its normal limit of movement, the pawl 34 will engage within the recesses 33 and lock the same in such position until the projections 29 can be engaged in the recesses and the discs 14 rotated to brin the pins 23 and 25 beyond center as before lescribed.

The return of the jack to normal position is accomplished by engagin the projections 29 in the recesses 31 and lifting upon the handle to bring the pins 23 and 25 back over the center when the weight of the article upon the cap 13 will tend to return the same to such normal position, and the pawl 34 will engage within the notches 38 when the same has been returned part way. The lugs 29 are then engaged in the recesses 23 and the extreme inner end of the handle 20 will engage a member 39 carried by the pawl 34 and thus move the member 34 from engagement with the notches 38 and permitting the return of the parts to normal position as will be readily obvious.

From the foregoing description taken in connection with the accompanying drawings it will be at once apparent to those skilled in the art to which an invention of this character appefrtains that we have rovided an. improved lifting jack having wlhat may be termed a variable ulcrum connected with*v the elevating member and the base by means of a double toggle connect-ion W'hat we claim as our invention is:

1. A jack comprising a body portion, an elevating member carried thereby, a fulcrum, a toggle connection between the 'fulrum and the elevating member for Operating the same, means for releasably securing said member in fully elevated position, and means independent of said first mentioned means for releasably securing said member in an intermediate position.

2. A jack comprising a body ortion, an elevating member carried there y, ay disc movably carried by the body portion, a link having one end pivotcd to the elevating member and its other end pvoted to said disc spaced from the center thereof, means for rotating said disc to elevate and lower said member, means engageable with the periphery of said disc for releasably securing the elevating member in adfusted position, and means connecting sai disc and body and co-operating with said link for securing said elevating member in elevated position.

3. A jack comprising a body portion` an elevating member carried thereby` a disc revolubly carried b v the body portion, a wrist pin carried by said disc. a lilik having one end pivoted to the elevatingl member and its other end pivoted to said Ywrist pin` means ttor rotating the dise to elevate and lower said member. and means for releasably securing the elvating member in any one or several positions.

4. A jack comprising a body portion, an elevating member carried thereby, a disc revolubly carried by the body portion, a wrist pin carried by said disc, a link having one end pivoted to the elevating member and its other end pivoted to said wrist pin, means for rotating the disc to elevate and lower tid member, and means engageable with said disc to releasably secure the elevating member in any one of several positions.

5. A jack comprising a body portion, an elevating member carried thereby, a double toggle connection between said member and body portion, the centers oi' said toggle connection being movable a slight distance beyond an imaginary perpendicular line to releasably secure said member in fully elevated position, and means for securing said member in an intermediate position.

6. A jack comprising a body portion, an elevating member carried thereby, a fulcrum, a toggle connection between the body portion and elevating member and said fulcrum and operable to raise and lower the elevating member, means for releasably securing said member in fully elevated position, and means independent of said first mentioned means for releasably securing said member in an intermediate position.

7. A jack comprising a body portion, an elevating member carried thereby slotted rotatable discs forming a readily variable ulcrum, and a double toggle connection between the body portion and elevating member and said fulcrum.

8. A. jack comprising a body portion, an elevating member vertically slidably mounted therein, a. vertically movably pivoted disc, a toggle link having one end pivoted to said disc off the center thereof and its other end Vpivoted to said elevating member', a second toggle link having its upper end pivoted to said disc diametrically opposite to the pivot oi' said other toggle link and its other end pivoted to said body portion,.and means lor rotating said discI to bring the pivots ot said toggle links connected with said discs in substantially vertical alignment to elevate said member.

9. A jack comprising a body portion, an elevating member vertically slidably mounted therein, a vertically movably pivoted disc, a toggle link having one end pivoted to said disc oft' the center thereof and its other end pivoted to said elevating member, a second toggle link having its upper end pivoted to said disc diametrically opposite to the pivot ot said other toggle link and its other end pivoted to said body portion, and means for rotating said disc to bring the pivots ot said toggle links connected with said discs in substantially vertical alignment to elevate said member, said pivots being movable slidably beyond an imaginary line drawn perpendicularly through the center oit said disc to releasably lock the elevated member in extended position.

10. A jack comprising a body portion, an elevating member vertically slidably mounted therein, a vertically movable pivoted disc, a toggle link having one end pivoted to said disc ott' the center thereof and its other end pivoted to said elevating member, a second toggle link having its other end pivoted to said disc diametrically opposite to the pivot of said iirst mentioned link and its other end pivoted to said body portion, means for rotating said disc to bring the pivots otsaid toggle links connected therewith in substantially vertical alinement to elevate said member, said pivots being movable slightly beyond an imaginary line drawn perpendicular through the center of said disc, and means engageable with one of said links when said pivots are passed beyond said imaginary line to prevent the accidental descent of the elevating member.

1l. A jack comprising a body portion, an elevating member vertically slidably mounted therein, a vertically movable pivoted disc, a toggle link having one end pivoted to said disc olii' the center thereof and its other end pivoted to said elevating member, a seoond toggle link having its other end pivoted to said disc diametrically opposite to the pivot of said first mentioned link and its other end pivoted to said body portion, means for rotating said disc to bring the pivots ot said toggle links connected therewith in substantially vertical alinement to elevate said member, said pivots being movable slightly beyond an imaginary line drawn perpendicular through the center of said disc to releasably secure the elevating member in fully elevated position, and a pawl carried by said body member and engageable in a recess in said disc to releasably secure said elevating member in an elevated position.

12. A jack comprising a body portion, an elevating member carried thereby, a disc rotatably mounted in the body portion, connections between said disc and elevating member whereby a rotation of said disc will raise and lower the same, and means for rotating said disc including a lever having one end pivotally connected with said member and provided with an intermediate projection selectively engageable in recesses in said. disc spaced diierent distances Jfrom the center thereof whereby the leverage ot said lever may be adjusted.

. In testimony whereof, we aiiix our signatures.

WlLLlAltl KOECK. JOSEPH KOECK. 

